Just for fun,
I tried
to calculate the wealth of the entire planet, and see how
rich/poor each person would be if we simply divided the world's wealth
by the world's population (six billion people).

If I use GNP data, i find that the world's total GNP is about
$30 trillion (the USA's GNP is $10 trillion and the USA accounts
for about 1/3 of the world's GNP).
Divided by 6 billion people, that's an average of $5,000 per capita.
That's yearly production of wealth.
Depreciation of goods is hard to estimate, but we can assume that
it is about 30% on average. So the accumulated wealth is
5000 minus 30% of 5000 minus 30% of this number minus...
a series that converges to about $10-11,000

If I use the data on net worth (average USA household net worth is
$182,381 as per the census, which means a total wealth of about
about $18 trillion for the 100 million USA households, which means
about $54 trillion for the wealth of all households of the world).
That's household wealth. Now we need to add government wealth, which is
approx 30-40% in the US, more in other countries. So the total wealth of
the world is about $70 trillion of dollars.
Thus the average human on this planet is worth $70,000/6= $11,000

So both ways we get the same number: if we distributed the wealth
of the world to the people of the world in equal terms, each
person would be worth $11,000

For the USA alone these numbers are:
Per-capita GNP: $38,000 and
Average net worth: $60,000 .